Influence of additional neutrons on the fusion cross-section beyond the N=8 shell
Abstract
Fusion enhancement for neutron-rich isotopes of oxygen on carbon nuclei was probed. To measure the fusion cross-section a 20O beam accelerated to Elab/A=2.7 MeV bombarded the active-target detector MuSIC@Indiana with a fill gas of CH4. Examination of the average fusion cross-section over the interval 12 MeV ≤Ec.m.≤ 17 MeV for 16-20O + 12C reveals that while even isotopes of oxygen exhibit essentially the same cross-section, the cross-section for odd isotopes can be either enhanced or suppressed relative to the even A members of the isotopic chain. Theoretical models fail to explain the observed experimental results.
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